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A stable mode of bookmarking by TBP recruits RNA Polymerase II to mitotic chromosomes

View ORCID ProfileSheila S Teves, Luye An, Aarohi Bhargava-Shah, Liangqi Xie, Xavier Darzacq, View ORCID ProfileRobert Tjian
doi: https://doi.org/10.1101/257451
Sheila S Teves
UC Berkeley;
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  • For correspondence: sheila.teves@berkeley.edu
Luye An
Cornell University
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Aarohi Bhargava-Shah
UC Berkeley;
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Liangqi Xie
UC Berkeley;
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Xavier Darzacq
UC Berkeley;
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Robert Tjian
UC Berkeley;
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Abstract

How a cell maintains transcriptional fidelity across the cell cycle has remained an enduring mystery in biology. One of the challenges arises during mitosis when chromatin becomes highly condensed and transcription is shut off. How do the new daughter cells re-establish the original transcription program? Here, we report that the TATA-binding protein (TBP), a key component of the core transcriptional machinery, remains bound globally to promoters of active genes in ES cells during mitosis. Using single molecule imaging in live cells, we observed that mitotic binding of TBP is highly stable, with an average residence time of several minutes. This stable binding is in stark contrast to typical TFs with residence times of seconds. To test the functional effect of mitotic TBP binding, we used a drug-inducible degron system and found that TBP binding promotes the association of RNA Polymerase II with mitotic chromosomes, and facilitates transcriptional reactivation following mitosis. Taken together, these results suggest that the core transcriptional machinery maintains global transcriptional memory during mitosis.

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The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY-NC 4.0 International license.
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Posted January 31, 2018.
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A stable mode of bookmarking by TBP recruits RNA Polymerase II to mitotic chromosomes
Sheila S Teves, Luye An, Aarohi Bhargava-Shah, Liangqi Xie, Xavier Darzacq, Robert Tjian
bioRxiv 257451; doi: https://doi.org/10.1101/257451
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A stable mode of bookmarking by TBP recruits RNA Polymerase II to mitotic chromosomes
Sheila S Teves, Luye An, Aarohi Bhargava-Shah, Liangqi Xie, Xavier Darzacq, Robert Tjian
bioRxiv 257451; doi: https://doi.org/10.1101/257451

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